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What are the factors that influence the silicone tube sealing effect?
Silicone tube is generally used in industrial water supply, supply more. But must take into account the sealing problem, Xiaobian introduce below factors influencing the silicon tube sealing effect of what?
Hose sealing the general effect is mainly formed by sealing structure, the choice and the oil film pressure, temperature, material compatibility, dynamic seal contact surface hardness, work material, geometry, surface roughness to decide.
Silica gel tube sealing material resistant to oil (liquid) in assessing the performance of detection
Seal rubber material resistant to oil (liquid) performance, the general use of standard oil immersion test, according to temperature conditions and test time test standard, through the contrast before and after immersion test value (such as the change of hardness, the tensile strength, tensile elongation rate of change of the rate of change, volume change rate, compression permanent deformation) to evaluate its performance.
Heat resistance: silicone rubber with heat resistance much better than ordinary rubber, can be in 150 degrees almost always used without change of performance; can be used continuously for 10000 hours at a temperature of 200 degrees; also can be used for a period of time at a temperature of 350 degrees. Widely used in the requirements of heat-resistant occasions: thermos bottle sealing ring of pressure cooker ring heat handle
Hardiness: ordinary rubber was delayed for -20 degrees ~-30 degrees, namely silicon rubber in the -60 degrees ~-70 degrees still has good elasticity, silicone rubber and some special formula can also withstand the extremely low temperature.
Weatherability: ozone effects of ordinary rubber produced in the corona discharge under the rapid degradation of silicone rubber, and is not affected by ozone effect. And for a long time in the ultraviolet and other weather conditions, the property is only a small change. Sealing materials used in outdoor
Electrical properties: silicone rubber with high resistivity and temperature and frequency in a wide range of resistance remained stable. At the same time, silicone rubber has good resistance to high voltage corona discharge and arc discharge. High voltage insulator, high voltage cap, electric appliance parts TV
Conductive: when adding conductive fillers (carbon black), silicone rubber has conductive keyboard conductive contact point, the electric heating element components, antistatic components, high voltage cable for shielding, medical conductive film
Thermal conductivity: when adding some conductive filler, thermal conductivity of silicone rubber has fins, heat sealing pad, copier, fax machine thermal roll
Anti radiation: containing phenyl radiation resistance of silicone rubber cable used in nuclear power plants is greatly improved, connectors and other electrical insulation
Flame retardant: silicon rubber itself is flammable, but add a small amount of anti burning agent, it has a flame-retardant and self extinguishing; and because the silicone rubber containing no organic halides, which burns without smoke or release, various fire strict situation.
Permeability: permeability silicon rubber film is better than the ordinary rubber and plastic wax film. The selectivity of another characteristic is to have different ventilation rate is very strong, can be used for gas exchange membrane medical supplies, artificial organs
In short, silicone tube typical or poly two methyl siloxane, with a spiral configuration of molecules, the intermolecular force is small, so it has good elasticity, pointing to the outside of the spiral of the formaldehyde free rotation, so that the silicone rubber has the unique surface properties, such as hydrophobicity and surface viscosity.
This article from the Shenzhen City Qiyu Silicone Rubber Co., Ltd.: http://www.szhcty.com/news_v.asp? Id=256
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